2 * collectd - src/collectd.c
3 * Copyright (C) 2005,2006 Florian octo Forster
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Florian octo Forster <octo at verplant.org>
21 * Alvaro Barcellos <alvaro.barcellos at gmail.com>
26 #include "utils_debug.h"
30 #include "configfile.h"
36 #endif /* HAVE_LIBKSTAT */
44 static void sigIntHandler (int signal)
49 static void sigTermHandler (int signal)
54 static int change_basedir (char *dir)
56 int dirlen = strlen (dir);
58 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
64 if (chdir (dir) == -1)
68 if (mkdir (dir, 0755) == -1)
70 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
73 else if (chdir (dir) == -1)
75 syslog (LOG_ERR, "chdir (%s): %s", dir, strerror (errno));
81 syslog (LOG_ERR, "chdir: %s", strerror (errno));
87 } /* static int change_basedir (char *dir) */
90 static void update_kstat (void)
94 if ((kc = kstat_open ()) == NULL)
95 syslog (LOG_ERR, "Unable to open kstat control structure");
100 kid = kstat_chain_update (kc);
103 syslog (LOG_INFO, "kstat chain has been updated");
107 syslog (LOG_ERR, "kstat chain update failed");
108 /* else: everything works as expected */
112 } /* static void update_kstat (void) */
113 #endif /* HAVE_LIBKSTAT */
116 * Remove all settings but `-f' and `-C'
118 static void exit_usage (char *name)
120 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
122 "Available options:\n"
124 " -C <file> Configuration file.\n"
125 " Default: "CONFIGFILE"\n"
127 " -f Don't fork to the background.\n"
129 "\nBuiltin defaults:\n"
130 " Config-File "CONFIGFILE"\n"
131 " PID-File "PIDFILE"\n"
132 " Data-Directory "PKGLOCALSTATEDIR"\n"
134 " Log-File "LOGFILE"\n"
136 " Step "COLLECTD_STEP" seconds\n"
137 " Heartbeat "COLLECTD_HEARTBEAT" seconds\n"
138 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
139 "by Florian octo Forster <octo@verplant.org>\n"
140 "for contributions see `AUTHORS'\n");
142 } /* static void exit_usage (char *name) */
144 static int start_client (void)
148 struct timeval tv_now;
149 struct timeval tv_next;
150 struct timespec ts_wait;
152 step = atoi (COLLECTD_STEP);
164 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
168 if (sg_drop_privileges ())
170 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
179 if (gettimeofday (&tv_next, NULL) < 0)
181 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
184 tv_next.tv_sec += step;
189 /* `curtime' is used by many (all?) plugins as the
190 * data-sample-time passed to RRDTool */
191 curtime = time (NULL);
193 /* Issue all plugins */
196 if (gettimeofday (&tv_now, NULL) < 0)
198 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
202 if (timeval_sub_timespec (&tv_next, &tv_now, &ts_wait) != 0)
204 syslog (LOG_WARNING, "Not sleeping because `timeval_sub_timespec' returned non-zero!");
208 while (nanosleep (&ts_wait, &ts_wait) == -1)
212 syslog (LOG_ERR, "nanosleep failed: %s", strerror (errno));
219 } /* static int start_client (void) */
222 static int start_server (void)
229 int error_counter = 0;
232 while ((loop == 0) && (error_counter < 3))
234 status = network_receive (&host, &type, &instance, &values);
244 plugin_write (host, type, instance, values);
246 if (host != NULL) free (host); host = NULL;
247 if (type != NULL) free (type); type = NULL;
248 if (instance != NULL) free (instance); instance = NULL;
249 if (values != NULL) free (values); values = NULL;
253 } /* static int start_server (void) */
254 #endif /* HAVE_LIBRRD */
257 static int pidfile_create (const char *file)
264 if ((fh = fopen (file, "w")) == NULL)
266 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
270 fprintf (fh, "%i\n", (int) getpid ());
274 } /* static int pidfile_create (const char *file) */
275 #endif /* COLLECT_DAEMON */
278 static int pidfile_remove (const char *file)
283 return (unlink (file));
284 } /* static int pidfile_remove (const char *file) */
285 #endif /* COLLECT_DAEMON */
287 int main (int argc, char **argv)
289 struct sigaction sigIntAction;
290 struct sigaction sigTermAction;
291 char *datadir = PKGLOCALSTATEDIR;
292 char *configfile = CONFIGFILE;
294 struct sigaction sigChldAction;
295 char *pidfile = PIDFILE;
300 char *logfile = LOGFILE;
304 operating_mode = MODE_LOCAL;
306 operating_mode = MODE_CLIENT;
310 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
317 c = getopt (argc, argv, "hC:"
335 #endif /* COLLECT_DAEMON */
338 exit_usage (argv[0]);
343 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
344 DBG_STARTFILE (logfile, "Debug file opened.");
348 * Read options from the config file, the environment and the command
349 * line (in that order, with later options overwriting previous ones in
351 * Also, this will automatically load modules.
353 if (cf_read (configfile))
355 fprintf (stderr, "Error: Reading the config file failed!\n"
356 "Read the syslog for details.\n");
361 * Change directory. We do this _after_ reading the config and loading
362 * modules to relative paths work as expected.
364 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
366 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
369 if (change_basedir (datadir))
371 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
379 sigChldAction.sa_handler = SIG_IGN;
380 sigaction (SIGCHLD, &sigChldAction, NULL);
382 if ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL)
384 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
390 if ((pid = fork ()) == -1)
393 fprintf (stderr, "fork: %s", strerror (errno));
399 /* printf ("Running (PID %i)\n", pid); */
403 /* Detach from session */
407 if (pidfile_create (pidfile))
410 /* close standard descriptors */
415 if (open ("/dev/null", O_RDWR) != 0)
417 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
422 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
427 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
430 } /* if (daemonize) */
431 #endif /* COLLECT_DAEMON */
434 * install signal handlers
436 sigIntAction.sa_handler = sigIntHandler;
437 sigaction (SIGINT, &sigIntAction, NULL);
439 sigTermAction.sa_handler = sigTermHandler;
440 sigaction (SIGTERM, &sigTermAction, NULL);
443 * run the actual loops
446 if (operating_mode == MODE_SERVER)
448 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL || operating_mode == MODE_LOG) */
454 DBG_STOPFILE("debug file closed.");
458 syslog (LOG_INFO, "Exiting normally");
463 pidfile_remove (pidfile);
464 #endif /* COLLECT_DAEMON */
467 } /* int main (int argc, char **argv) */